Fuel-resisting material



Patented in, 30,1939 v l I 2,160,372

1 UNITED STATES PATENT. oF c e:

FUEL-BESISTIN G MATERIAL Hermann Stirk, Bad Soden, ,Germany, assignor to I. G. Farbenindustrie Aktiengesellschaft, Franktort-on-the-Main, Germany No Drawing. Application July 1'1, 1936, Serial No. 91,233. In Germany July 25, 1935 3 Claims. (Cl. 260-87) The present invention relates to'fuel resisting except the aliphatic hydrocarbons, and entirely materials. unstable to fuels. I

' Known liquid fuels, especially motor car fuels, As mixed polymerizates there may be used, for consisting of a mixture of benzine with other cominstance, polymerizates of vinyiformiate with bustible, similarly volatile liquids such as benzene vinylacetate, vinylpropionate, maleic acid di- 5 and alcohol, have a very high dissolving power for methylester, maleic acid'diethylester, acrylic acid a great number 'of crude materials for varnishes. ethylester, acrylic acid methylester, methacrylic Hence, for making lacquer coating which is to acid ethylester. It is suitable that in the mixed resist fuel, it does not suffice to use a crude mapolymerizates the vinylformiate radical is presterial insoluble in benzine, of which materials ent in a proportion of at least 50 per cent because 10 there is a suillcient number; on the contrary, otherwise the resistance to fuels of the materials there must be used a crude material which is enis diminished. tirely insoluble in a mixture of the different agents The polyvinylformiate used as starting material which are used in an often varying proportion may be suitably prepared by heating the monofor making mixed fuels. In this direction neither meric product for a prolonged time (for instance, 1 the crude natural materials for varnishes not about hours) in a reflux apparatus at mthe synthetically prepared materials have hitherpelatures up to about 50 C. in the presence of to been satisfactory for not only must they be peroxides such as hydrogen super-oxide, benzoyl insoluble in the fuel mixture but also they must peroxide, oleic acid peroxide. In the preparation so be soluble in certain solvents in order to provide of mixe p lym riz es th P lym r ation m- 20 the desired varnish. Hitherto there have been peratu e y be co e po d y 811 1. for known only crude materials for varnishes which stance during the polymerization of a mixture are insoluble in the fuel'but are swollen by it, of vinylformiate and vinylacetate at about 70 C. or are resistant to fuels but which have an in- F l resis ing sof ening agents may be incoras ferior solubility in all other solvents in question. porated to t v y -p l m i at n p It has been proposed to use substances which as ucts named in the specification and the exsuch do not resist fuel but become resistant by an amples t in, such s t n n a ts ar for nft t t t 4 stance glycerine triformiate, glycerine-mono- Now I have f und that polymeric vinylformiate acetate and glycerine-di-acetate, the condensaand mixed polymerizates prepared with the aid of tion produ s fr m h -di arboxy i s, d 30 vinylformiate are very readily soluble in certain scribed in the co-pending application Serial No. solvents, though in a very limited number, but 751,098, filed November 1, 1934, in the name of are entirely insoluble and cannot swell in fuels, n Persiel, Gerhard B l Franz Grem and for instance in mixtures of benzene or also other ,Rudolf Semmig, such as the condensation product aromatic hydrocarbons, or alcohol (methanol, r m 11 y n ly nd i ycolie acid. 35 ethanol) with benzine (aliphatic hydrocarbons) h following ex mples serve to illustrate the within the boiling range suitable for motor fuels, invention t t ey a e not intended to limit it whatever the proportion in the mixture. As solthereto! vents for polyvinylformiate there may be used, (1) In Order to Provide the surfaces 1 articles 40 for instance chlorinated hydrocarbon r k tones of all kinds which come in contact with motor or mixtures of these liquids with each other or fuels, such as benzine casks. ben tanks, rigid with certain quantities of other solvents. In the or elastic benzine tubes and the l With a c same manner l i lformiate and its mixed mg resistant to fuel, the surface is coated with polymeflzates may be worked to shaped masses, a thin layer of polyvinylformlate, for instance king nd 0 on which by applying to the surface a solution of poly- $2: figfsg fi g f 2 nsmteflal vinyl-formlate in acetone or methylenechloride or in a mixture of the two solvents. It could not be foreseen that polyvinylformlate In this manner a varnish coating of an extraandits mixed Pdymeflzates would have the prop ordinary fastness to motor fuels is obtained. In erties of solubility described above. On the conconsequence of the high elasticity of the poly trary it had to be supposed that they would have. vinylformiate this varnish coating is especially solubilities similar to those of other known D suitable for lending resistanceto fuels to elastic vihylestels. above all the polyvinyla tate wh and flexible tubes from caoutchouc vulcanizates is closely related to the polyvinylformiate. The or artificial materials.

polyvinylacetate is soluble nearly in all solvents, (2) Polyvinylformiate is shaped with applica- 55 tion of a raised pressure and a raised temperature so as to form tubes and other shaped bodies. Shaped pieces of a high elasticity and flexibility are obtained which on account of their absolute stability against motor fuels are especially suitable as benzine pipes or as elastic packing material which comes in contact with fuels.

I claim:

.1. Devices for storing and conveying mixed liquid fuels containing an aliphatic hydrocarbon and at least one other component selected from the group consisting of aromatic hydrocarbons and aliphatic alcohols, at least the fuel contacting surfaces of said devices consisting of a fuelresisting material comprising a polymerization product of vinyl formate.

2. Conduits for conveying mixed liquid fuels containing an aliphatic hydrocarbon and at least one other component selected from the group consisting of aromatic hydrocarbons and allphatic alcohols, at least the fuel-contacting surfaces of said conduits consisting of a fuel-resisting material comprising a polymerization product of vinyl formate.

3. Devices for storing and conveying mixed liquid fuels containing an aliphatic hydrocarbon and at least one other component selected from the group consisting of aromatic hydrocarbons and aliphatic alcohols, at least he fuel-contacting surfaces of said devices consisting of a fuelresisting material comprising a mixed polymerization product of vinyl formate and up to 50% of another unsaturated compound capable of being polymerized. 

